Lens component and image display device

1. An image display device comprising: a display panel having a plurality of unit pixel groups arranged two-dimensionally on a plane parallel to both of first and second directions perpendicular to each other, each of the plurality of unit pixel groups including N partial pixels arranged along the second direction, where N is an integer of 2 or greater; and a lens component provided with unit lenses corresponding to the unit pixel groups in the second direction, the lens component forming an image on the display panel as an object surface onto an image surface, wherein the lens component comprises K unit lenses, each extending in the first direction and having a common structure, arranged in parallel at a minimum period P L in the second direction perpendicular to the first direction, wherein each of the K unit lenses includes M partial lenses sectioned within the minimum period P L in the second direction and a flat part disposed between the M partial lenses, where each of K and M is an integer of 2 or greater, wherein each of the M partial lenses is a portion of a circle having an axis that passes through a center of the circle, each of the axes of the circles of the M partial lenses being different from each other but parallel to a third direction perpendicular to both of the first and second directions, the M partial lenses forming an image of a common point on the object surface onto the image surface at respective positions different from each other, and wherein the flat part of each unit lens faces the image surface.

2. The image display device according to claim 1 , wherein, in each unit lens, the flat part has a width in the second direction equal to or smaller than a distance in the second direction between the respective optical axes of the M partial lenses.

3. The image display device according to claim 1 , wherein, in each unit lens, the flat part has a width in the second direction smaller than ½ of that in the second direction of the unit lens.

4. The image display device according to claim 1 , wherein the M partial lenses included in each unit lens have the same focal length.

5. The image display device according to claim 1 , wherein, in each of the plurality of unit pixel groups in the display panel, a shielding region exists between N partial pixels along the second direction; and wherein the width of the shielding region in the second direction is equal to or smaller than a distance in the second direction between the respective optical axes of the M partial lenses included in each unit lens of the lens component.

6. The image display device according to claim 1 , wherein M is 2; and wherein a midpoint in the second direction between respective optical axes of two partial lenses included in a given unit lens located near a center in the second direction in the K unit lenses of the lens component is identical to a center position of a given unit pixel group located near a center in the second direction in the plurality of unit pixel groups in the display panel.

7. The image display device according to claim 1 , wherein the lens component and display panel have respective marks for alignment in assembling thereof.

8. The image display device according to claim 1 , wherein the flat part is further away from the display panel along the third direction than at least a portion of the respective M partial lenses.

9. The image display device according to claim 2 , wherein at least a portion of each of the M partial lenses is closer to the display panel along the third direction than the respective flat part.